Power-transmission device.



G. A. CUTTER.

POWER TRANSMISSION DEVIUE.

APPLICATION FILED JULY 24, 1905.

Patented Feb. 15, 1910.

3 SHEETS-SHEET 1.

171K655 es G. A. CUTTER.

POWER TRANSMISSION DEVICE.

APPLICATION rum) JULY 24, 1905. 949,2 5, Patented Feb. 15, 1910. s SHEETS-SHEET 2.

..Jl l'" G. A. CUTTER.

POWER TRANSMISSION DEVICE.

APPLICATION FILED JULY 24, 1905.

949,265, Patented Feb. 15, 1910.

3 SHEETS-SHEET 3.

GEORGE CUTTER, OF NEWTON HIGHLANDS, MASSACHUSETTS;

rowens rnnusmassion DEVICE.

Patented Feb.- 15, 1910.:

-' ;driven from a at varying speeds. These mounted in suitable-bearings vh ehesemds ets a e. I '1' {STATES PATENT four-E...

To all whom 'it may concern: 01 03 are the disks on the driving shaft Be it known that I, GEORGE A. Come, a and (l d are the disks on the driven shaft, vcitizen of the United States of America, rethey being connected b a suitable belt, in-

. sidin at Newton Highlands, in the county dicated at 6. Each of these disks is con- 5 of iddlesex and State of Massachusetts, nected with its shaft by splines, as indicated have invented certain new and useful Imat a sothat they will revolve with it, but provement's in Power-Transmission Devices, in the embodiment of the invention shown ofwhich the following is a specification. in the drawings the disks of each pair are My invention relates to variable speed ada ted for movement lengthwise of the 10 power transmission devices of the class in sha t. These disks have hubs f and collars which oneof the pulleys is composed of a g, which are shouldered as at'g, forming re-- pair :of disks at least one of which is slidcesses in which are located stifli' spiral lngly mounted on the shaft. The edges of springs h for purposes which will be hereinthe driving belt contact withthese disks and after described. So far as the moving of 15 its driving diameter is chan ed by changing the disks oes the collars can be considered the distance between the dis ks. as integraFparts of the hubs.- Screws z pass In the embodiment of my invention illusthrough the hubs and are threaded into the trated both of the pulleys are made up as collars with right and'left hand threads, as

above described and all disks are arranged indicated, so that rotation of the screws in 20 tp'slide "on the shaft, but my invention, one direction will permit the disks to be which provides a novel method-of moving moved apart by the pressure of the belt and. In the .dis s along the shaft, is a plicable as the reverse direction will draw them together.

, well to a case where but one pulley and one On one end of each screw there is mounted member of the pulley is adjustable, as to a a beveled pinion j which has a hearing at 25 case where there is duplication of these feay" in a bonnet is which revolves with the tures; "Furthermore, I provide a novel shaft. Studs Z,,;supported at one end in the .means for mantaining an even tension on bonnet and at the other end in the shaft, the-belt at-all driving diameters of the carry beveled gears m which mesh with the pulleys); j i beveled pinions on the ends of the screws; 30 In th drawings- Figure ljis a general these. studs also carry spur pinions n which lan view.illustratinggan'embodiment of my mesh withracks 0 which are carried by the invention in which t e .part s ar'e moved by shaft so that they will rotate with it but may hand, the parts being shown in'central sec- 1 be moved lengthwise of it. On the outer end tionon one shaft to illustrate the construcof the sleeve 0', in which the racks are cut, 35 t1on. Fig. 2 is a detail side elevation of the are mounted ball races r 1 between which gear connections. Fig. 3 is an end section are located the balls .9. A nut 0 at the ,on the lme ww of- Fig. 2. Fig; .4 shows in outer end of the sleeve 0' holds the ball races plan and partly in section an embodiment on the sleeve. These ball races are inclosed g the' nvention which the .disk-movin' j by a yoke collart, which is connected with 40 mechan sm. s actuated by ower derive a shifting lever u, which is suitably mounted qfro nthesha ft. Fig. 5 is a etail sideeleas at u and carries a beveled ear segment vation of the mechanism illustrated in Fig. -v which is enga ed by the beve ed pinion o 4, taken on. the. line y'y.and-looking in the turned bythe and wheel '0 It is to be direction of the arrow, illustrating the understood that the shaft a is equipped 45 "brakes nd co ect o sig- 6 an end, with the same character of shiftin devices,

8801 1011 of the shaft and rack sleeve showing; the disks being indicated at d, t e screws the gear fZOIlIlBCtlODSu l at 5 the nut collars at g the bonnet at Referring to the embodiment ofFig. 1 of; 70 the rack sleeve at 0 and the yoke at r ,the drawings a a are the shafts, one off i and that the ends of the shifting lever 11 50 which, a, may considered 'as hav-i a are connected with the yoke collars t 25 9-. P

c ns ant rate of rotation, the other, a, being The device operates in the following manper, it being understood thatv all .parts ex-.

.cept the yokes rotate with the: shaft; A ur p th hand wh r 2 o'th le tv l disks d d to move apart.

swing the shifting lever u, causing the yoke t to move outwardly away from the bonnet.

The inner flange of the yoke engages the ball race r and through the balls the race 1*, which brings up against the nut 0 and so causes the rack sleeve 0" and racks 0 to move outwardly with the yoke. This outward movement of the racks, as indicated by the arrow, will cause the rotation of the spur pinions n, the beveled gears m, the beveled pinions j and the screws 2' in the directlons indicated by the arrows, permitting the On the shaft a this same movement of the hand wheel '0 moves the rack sleeve and the racks inwardly, causing the gears and the screws to rotate in the opposite directions from those on the shaft a, .thus drawing the disks 03 al together. It is seen that during this shifting-movement of the disks the thrust of the disks is taken by the ball bearings s and the thrust of the shaftis taken up by the ball bearings indicated at as at the end of the shaft.- As soon as the disks, have been moved to the desired position of adjustment the pressure of the"belt tending to separate the disks is exerted on the threads of the screws 2', and, as is clearly seen, this end thrust of the disks is not transmitted by the screws to other parts. Consequently, as soon as this adjustment is attained and the device resumes its normal operation the end thrust on the shifting mechanism, in this casethe yoke, is entirely relieved.

For many reasons the relief ofthe shifting devices from a continuous pressure exerted by the end thrust of the disks is decidedly advantageous. Y

Another feature of my invention resides in the automatically operating means for maintaining an even tension on the belt for all diameters of the driving pulleys. As will be noted from the above description the screws 71 are threaded into the'nut' collars g and motion is transmitted to the disks through the springs h. It will also be noted that there is a slight clearance between the inner ends of the nut collars and the hubs of the disks. As the screws 2' are turned to draw the nut collars together the movement of these collars is transmitted through the springs h to the disks d (1. Thus the disks are permitted a slight longitudinal movement with respect to the collars and are supported by the stiff springs IL, thus ermitting the belt to accommodate itself to the different conditions and maintain it at an even tension.

Fig. 4 shows a method of operating the sliding disks by power derived from the driving shaft, and this is the only respect in which 'it differs from the device illustrated in the'first three figures above de scribed. 100 denotes the driving shaft and 1 the driven shaft. The disks are denoted by the numerals 2-2 and 20-20. They are mounted -to slide on their shafts and their hubs are threaded to receive the screws 3-3and 30-30. It will be noted that the threads 1-4 are both left hand threads and 5-5 are right'hand threads. The screws 3-3 carry the beveled pinions 6-6, meshing with the beveled gears 7-7, which are mounted on stud shafts 8-8, which also carry the. spur pinions 9-10. On the rack sleeve 11 are cut two racks 12-13, and it will be noted that these racks are diagonally opposite one another so that the rack 12 meshes with the upper side of the pinion 9 while the rack 13 meshes with the under side of the pinion 10. The rack sleeve is connected with the collar 14 which in turn is connected. with one end of the lever 15*, whichis pivoted as at 15, its opposite end being connected with the collar 140 on the driving shaft 100. The screws 30-30 are provided with beveled pinions 60-60, bev-' eled gears 7 0-7 0, spurpinions 90-110 and racks 120-130 cut in a rack sleeve 21 which such manner that a motion of the brake rod in one direction will apply one brake and motion in the other direction will apply the other brake, it being impossible to apply both brakes at the same time;

The operation of this device isas follows, assuming the parts to be in the positions shown in Fig. 4, where the shaft 1 is being driven at its lowest speed. To increase the speed of the shaft 1 it is necessary to decrease the driving diameter of its pulley by separating the disks 2-2 and increase the driving diameter of pulley on the driving shaft by moving the disks 20-20 together. To accomplish this result power taken from the driving-shaft 100 is utilized to draw the disks 20-20 together, and through the gear and rack devices and the lever 15 connecting with the gear and rack devices on-the driven shaft '1 the disks 2-2 are permitted to be moved apart. The driving shaft 100 rotates in the direction of the arrow and under normal conditions the gear 170 rotates with it. By applying thebrake 190 tothe hub 180 of the gear 170 it is caused to lag behind the shaft 100 or in effect to rotate in the opposite direction, as indicated by the arrow, and the pinions 150-160 revolve about it, rotating in the 100 connected to a common brake rod 200 in directions indicated by the arrows, causing will cause the disks 2020 to move together.

Y The movement of the screws 30-30 is communicated through the beveled pinions -60, beveled gears 70 and spur pinions 110 to the racks 120.130, all of the parts moving in the directions indicated by the arrows to carry the collar 140 inwardly along the shaft 100. This inward movement of the collar 140 causes an outward movement-of the collar 14 on the driven shaft 1 through the pivoted lever 15"., and the outward movement of the collar 14- acting through the racks 12, 13, spur pinions 9-10 and beveled gear connections 67, arranged similar to those on the shaft 100, causes the rotation of the screws 33 in the direction indicated by the arrows, this direction of rotation permitting the disks 2-2 to recede from one another. When the proper change of speed is obtained the brake is released, leaving the gear 170 free to rotate with the shaft 100.

Let it now be assumed that by the opera tion described the disks 2-2 have been separated to the limit and the disks 2020 moved together, under which condition the shaft 1 is driven-at its greatest speed. Now

if it be desired to reduce the speed of the shaft 1 the brake rod 209 is moved to set the brake 19 onto the hub 18 of the gear 17. The direction of rotation and movement of all of the parts beginning with the screws 3--3 and including the beveled gears and racks and pinions on the shaft 1, the lever 15 and the racksand pinions and beveled gears on the'shaft 100 and the screws 3030 is now exactly the reverse of the directions of movements'indicated by the arrows, and the disks 22 will be moved together, the collar 14 will be moved in on the shaft 1, the collar 140 will be moved out on the shaft 100 and the disks 20-20 will be moved apart. heavy duty comes in increasing the driving diameter of'one of the pulleys by forcin the disks together, which is accomplishe of course by rotating the screws in the proper direction. By the arran ement of my device the power from the sha to rotating the screws to force these disks together and then through the connection with the other shaft the screws engaging the other pair of disks are rotated to permit the disks to separate. It is clear that in this arrangement as well as in the construction speed. under any pressure which they are illustrated in Figs. 1 to 3 the disks cannot be separated for the purpose of varying the subjected-to by the belt, they being movable only when some means is'a plied 'to turn the screws. This provision or operating the In changing the speed ratio the is applied directly disks'by power is extremely conveniefit,particularly in-cases where the device is subjected to heavy duty.

I claim 1. The combination in a power transmis-" .lever, and positive connections between said element and said lever whereby the movement of said lever causes said element to slide on its shaft, said connections including a pair of rotary parts having a threaded engagement with said sliding element.

2. The combination in a ower transmisthereon, the pulley on one shaft being made 'up of disks at least one of which is capable of movement toward or away from the other to vary its driving diameter, of means, operative independently of said shaft, for causing the movement of said disk, comprising mechanism rotatably securedto said shaft and which is inoperative under pres sure exerted by the disk, said mechanism including a rotatable part havin threaded engagement with said movable isk, and a lever for actuating said mechanism.

3. In a variable speed power transmission device the combination with the shafts, and pulleys mounted therein, one of wh ch s made up of a pair of disks one of which is -mounted to slide along its shaft, of means for moving said disk comprislng'an actuating lever, and connections rotatably secured to said shaft between said lever and said disk and operative independently of said shaft, said connections including a part supported by said pulley and adapted, to positively transmit power from said lever to said disk to move it along the shaft but inoperative under pressure exerted by said disk. I

4. 1m a power transmission device the shafts, pulleys thereon each made up of separate elements, screw threaded bars en ging the hubs of the elements of said pul eys to move them lengthwise of said shafts, racks mounted to slide along said shaft:i

. connections between the racks and thread bars to causerotation of the latter upon the A movement of the former, and -mans for moving said racks.

5. In a variable spe for moving said disks comprising an actuat ing lever, and connections between said lever and said disk, said connections being operative independently of the shaft and'adapted' ed power transmission device the combination with the shafts, and r disks to move them along the shaft but inoperative under pressure exerted by said disks,

said connections including a" member supported by said pulley.

6. In a variable speed power transmission device the combinatlon with the shafts, and pulleys mounted thereon, said pulleys 'being made up of pairs of disks with a belt groove between them, one of'which disks is mounted to slide on its-shaft, of means for moving said sliding disk comprising a screw having threaded connection with said disk, an actuating lever, and connections between said screw and lever operative independently of the shafts for rotating the former.

7 In a variable speed power transmission device the combination with the shafts and pulleys mounted thereon, said pulleys being made up of pairs ofdisks mounted to slide on the shafts, of means for sliding said disks comprising screws having right and left hand. threads engaging corresponding threaded parts connected with the disks, an actuating lever, and connections between said screws and lever operative independently of the shafts for rotating the former,

' as and for the purposes specified.

8. In a variable speed power transmission device the combination with the shafts, and the pulleys mounted thereon, said pulleys being made up of pairs of disks mounted to slide on the shafts, of screws having one a right and the other a left hand thread and operatively' connected with one of said disks, beveled pinions on said screws, beveled gears meshing therewith, spur pinions mounted on said beveled gear studs, racks meshing with said spur-pinions and sliding along the shaft, a lever, and connections between it and said racks, all substantially as described and for the purposes set forth.

9. In a variable speed power transmission device the shafts, pulleys formed from pairs of disks slidingly mounted thereon, said disks having shouldered hubs, recessed nut collars fitting on said hubs against the shoulders forming therewith chambers, springs located in said chambers, an actuating lever, andv connections between said lever and said nut collar operative independently of the shafts for moving said disks through said springs, substantially as described and for the purposes set forth.

.10. In a power transmission device the shafts, pulleys thereon, one of said pulleys being made up of elements at least one of which slides along the shaft, one or more threaded bars connected with the hub of the movable elembnt to slide it, and means for rotating said bars comprising a gear loosely mounted on the shaft and normally rotating withit, pinions on the bars in engagement 6{viwith said gear, and means for retarding the rotary speed of said gear.

bars connected with the hubs of the elements 1 of said pulleys to move them lengthwise of the shafts, racks slidingly mounted on the shafts and having rotary driving connections with said threaded bars, gears loosely mounted on said shafts, pinions on said bars in mesh therewith, brakes for said gears, and a centrally pivoted lever connecting said racks.

12; The combination in a variable speed power transmission device with the shafts and pulleys thereon, said pulleys being made up of elements at least one of which in each pulley is adapted to slide along its shaft toward or away from its cooperating element, of means arranged in connection with and operated by either shaft for moving the sliding element of the pulley thereon toward its cooperating element, and means connect-o ed with and o erated by said means for moving the sliding disk of the pulley on the other shaft away from its cooperating element, as and for the purposes specified.

13. In a variable speed power transmission device the shafts, pulleys mounted on each shaft, said pulleys being made up of elements adapted to slide toward and away from each other, bars each having right and left hand threads which engage the elements of each pulley, means for causing the rotation of said bars, a lever having its end secured to said means on each shaft and pivoted at a point between its ends, and devices for connecting the threaded bars of either pulley to its shaft, whereby when the connection between the bars of one pulley and its shaft is made said bars are caused to revolve moving the elements of said pulley toward each other and the bars of the other pulley are revolved to move the elements of saidpulley in a direction opposite to the direction of, movement of the elements of the first mentioned pulley, substantially as described. V

14;, In a variable speed power transmission device, the shafts, pulleys on each shaft made up of pairs of disks, one of each pair being slidingly mounted on its shaft, means for transmitting power from either shaft to shift its movable disk toward the other, and connections between the movable disks on each shaft operative independently of said shafts whereby the movement of one disk by the power from its shaft will cause the movement of the other disk but'in the oppo site direction.

15. In. a variable speed power transmission device in combination with two shafts and the belt, pulleys mounted on the shafts, each pulley being made up of a pair of disks one of each pair being adapted to slide on I its shaft to vary the driving diameters of the pulleys; threaded bars engaging the mov able disks; shifting mechanism on said shaft rotatable with but operative independently thereof for turning said threaded bars to move said disks; a pivoted lever having its end connected with said mechanism on each shaft so that movement of the mechanism on one shaft in one direction will cause the movement of the mechanism on the other shaft in the opposite direction; and means for 'applyin power from either shaft to the threaded ars of its movable disk to cause the movement of said disk in one direction and, through the shifting mechanism on each shaft and the lever, the movement of the disk of the other shaft in the opposite direction, said means being operative on only one shaft at a time.

16. The combination in a variable speed power transmission device with the shafts and pulleys thereon, each pulley being made up of elements one of which is adapted to slide along its shaft toward or away from its cooperating element to vary the diameter of said pulley, of a plurality of bars in threaded engagement with the movable element' of each pulley, means operated by a shaft for rotating the bars connected with the movable element of the pulley thereon, and mechanism connected with and operated by the rotation of said bars for rotatlng the bars connected with the movable element of the pulley on the other shaft, as and for the GEORGE A. CUTTER.

Witnesses:

WATSON G. CUTTER, Bnssm T. HALL. 

